Tic Tac Toe IO: Brain Battle On Digital Chessboard

Tic Tac Toe IO is a classic puzzle game reimagined with a new look and customizable game board. Start competing with friends or global opponents in brain-challenging matches!

Game Overview

Each game in Tic Tac Toe IO starts with choosing the board size and victory conditions. From the traditional 3x3 board to the expanded 21x21, you have the right to adjust the winning rules. In addition, you can set the difficulty and time limit for each move, creating an exciting pace in each game.

Game Modes

Computer Mode: Challenge yourself with AI with three levels from easy to difficult.
Online Mode: Connect globally in real time.
Two Player Mode: Supports various board sizes such as 3x3, 9x9, 15x15 and 21x21. In this mode, two players will take turns clicking on the same device.

How to Play

Move your mouse and click on an empty space on the board to place an X or O.

Pro Tips

Prioritize occupying the center position on the 3x3 board to increase control.
Always watch for winning sequences and stop your opponents in time.
With a large board, build multiple attack directions at the same time to dominate the space.